1. Put all files (firmware zip and rom zip - available in the download section) on the Root of your SD card (this is for ease of access, but if u prefer not up to you , but firmware zip MUST BE in the Root of ur sd card)

2. Boot into bootloader and when prompt to update, choose yes and wait till it finished, in the middle of the process it willl reboot dont worry just let it finish what its doing, DONT INTERRUPT